Improvement in rotary pumps



n.3.REYNoLna ROTARY-Pump.

Patenngd :une 1s, 187e.

Ulvrrnn STATES Partnr oar-'rca ROBERT BURNS REYNOLDS, 0F STOOKPORT, NEW YORK.

IMPROVEMENT iN RoTARv PUMPS.

Specification forming part of Letters Patent No. 178,672, dated June 13, i876; application `filed May 2 2, 1876.

To all whom it may concern: n

Be it known that 4I, R. BURNS REYNOLDS, of Stockport, Columbia county, and State of New York, have invented a new andImproved Rotary Pump, of which thefollowing. is a specification:

M y invention consists of two rotary pistons on parallel axes, both turning in the saine direction, so that they have a wiping action on each other instead of the rolling development ot' one on the other, as has always been the case in pumps of this character.

Some ofthe advantages of the arrangement are, iirst,it allows of the sides ofthe pistons being true' arcs of circles, whichean be fitted up in the simplest manner; second, it allows ot' couplin g the shaf'ts by cranks and connect-l ing-rods, which run smoother and stiller, and with less wear than gears; third, it allows of locating the inlet and outlet at will in different positions; and, fourth, it produces van alternate suction 'and discharge on each side of the pistons, enabling two independent suctions and discharges to be used, which is desirable in some cases.

In the accompanying drawing, Figure 1 is a sectional elevation of my-improved pump,

.taken on the line X X of Fig. 2, and Fig. 2 is a top view. v y I A represents two circular chambers in the case, running into each other at one side in l such a manner that lines drawn from the points a, where the circles cnt each other, form right angles at said points, a proportion necessary to allow the sides of the pistons B to be formed on arcs of true circles, as above stated. G represents the inlet and outlet pipes, through which the water will pass either way, according as the pistons are turned one the indicated positions in dotted lines. The' distance of the shafts apart and the curve of piston-faces, arev dependent upon each other; and, when fitted with careful reference to this dependence or relation, the pistons ,maintain a regular and uniform tit all the way roun`d z'. e., throughout their revolutions, whether in contact with the cylinder-case or with each other. The radius of the curve of face yof piston is the side of the square inscribed in a circle whose diameter is 'the same as the longest diameter of the pistonhin other words, the radius is the chord Vof one-quarter of the circle forming each bore ot' the pump-case. The circles forming-the interior ot' the cylinder-case intersect eachother in such a nianner as to cut out one-quarter of the circumference of each. To find the distance ofthe two centers ofthe piston-shafts apart, I square the radius ot'bore ot' pump-case, double this result, and extract the square root; this root is the distance required, lf the shafts are placed farther apart, the curve of piston-face becomes a full ellipse; it' near together, the curve becomes so short as to reduce the diameter of the piston, and make it too smallfor case. The cavities in the rim of the vcase are different in position and size for different varieties of the pump. Y

The positions ofthe suctionl and discharge openings are determined by placing the piston on the side next to the .opening to be located horizontally, when'the point-of the piston next the case will mark the position of the upper'side of suction or discharge pipe. (See d.) Now, turn the same piston till the opposite point of piston to that last observed stands exactly at the upper intersection of the circles forming the case. rlhe lower end ot' the piston will then mark the lower side ot' the suction or discharge pipe. rBhe positions of the cavities in upper side of case are determined by placing the piston vertical. Mark where the upper end strikes V"case, (see 1),) then turn same piston till lower point comes to lower intersection ot' the circles of case, and mark again at e. These pointslimit the c avity.

The chamber above 4and the chamber below are each independently and alternatelysuc'- tion and discharge; but, by means ot' the cav-ities in the cylinder-case above each piston,

ldie suction and discharge of the upper chainber are caused tohe made throughv the same orifices as those of the `lower chamber. By omitting the cavities an independent suction and discharge may heconnected with each chamber. The suction `and discharge may bc located above the centers of the pistons, in the saine relative arrangement as they are represented below, Iand they may he located vertically at the centers of the case, one above, and one below.

Packing may be applied to the points ofthe pist-ons in any approved Way, if desired.

Haring thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination, in a case, A, of' two pistons, B, whose sides are true arcs of circles,

and which are arranged on parallel axes, and geared to run in the sanne direction. k

2. The pistons B, having sides constructed on true arcs or circles, and being mounted on i parallel axes,V which are coupled by cranks 

